/Engine/Plugins/Importers/USDImporter/Source/UnrealUSDWrapper/Public/UsdWrappers/UsdAttribute.h
Wrapped pxr::UsdObject functions, refer to the USD SDK documentation
bool GetMetadata ( const TCHAR * Key, [UE::FVtValue](API\Plugins\UnrealUSDWrapper\UsdWrappers\FVtValue) & Value ) const